Phylum Arthropoda

Hermit Crabs

Hermit crabs only have a hard exoskeleton on the appendages and must conceal their soft body parts within empty gastropod shells.  They will exchange shells as they grow and may need to fight other crabs to do so.  They are especially active at night and may be seen by the hundreds in shallow tide pools.

 

HAWAII

Calcinus elegans

Makapu'u tidepool, Oahu

ELEGANT HERMIT CRAB

Common in shallow and deeper water.  Only Hawaiian specimens have orange bands, others regions are turquoise.

Calcinus laevimanus

Kapoho Point, Kailua, Oahu, Hawaii

LEFT-HANDED HERMIT CRAB

Legs banded black & white, the left claw is large and white with some black.  Very common.

Calcinus seurati

Keahole Point Tide Pool, Kona

Mokuleia, Oahu, intertidal

SEURAT'S HERMIT CRAB

Legs banded black & white, the claws are dark gray.  Very common.

Calcinus haigae

Kewalo, Oahu Hawaii, 30 feet

HAIG'S HERMIT CRAB

Purple legs with red spots and white tips.  Not common at scuba depths.

Calcinus laurentae

Kewalo, Oahu Hawaii, 50 feet

 

Kewalo, Oahu Hawaii, 50 feet

Sea Tiger, Oahu, 100 feet

LAURENT'S HERMIT CRAB

Common in small shells at scuba depths.  Red legs with white tips, black eyes with white dots.  Endemic to Hawaii.

Ciliopagurus strigatus

Makaha, Oahu, 35 feet

Makapu'u tidepool, Oahu

CONE SHELL HERMIT CRAB

Inhabits cone shells and others with a narrow opening.  Body is very depressed.  Hawaii & the Indo-Pacific.

Dardanus megistos

Cargo Pier, Midway, 35 feet

WHITE-SPOTTED HERMIT CRAB

Uncommon in large mouthed shells at scuba depths.

Dardanus sanguinocarpus

Leleiwi, Hawaii, 50 feet

 

Kewalo Pipe, Oahu, 50 feet

Sea Cave, Oahu, 30 feet

 

Sea Cave, Oahu, 30 feet

Sea Cave, Oahu, 30 feet

BLOODY HERMIT CRAB

Fairly common inhabiting medium-sized shells.  Hawaii, Marquesas, Marshall Islands.

Dardanus gemmatus & D. pedunculatus

Makai Pier, Oahu, 10 feet

Nanakuli, Oahu, 25 feet

 

Nanakuli, Oahu, 25 feet

 

Haleiwa Trench, Oahu, 75 feet

Sea Cave, Oahu, 60 feet

JEWELED ANEMONE CRAB

Occasionally seen on reefs.  Dardanus pedunculatus has granules covering the entire left claw.  Attaches two types of anemone outside of and within the shell.  The anemones eject sticky acontia threads if disturbed.

Aniculus hopperae

Haleiwa Trench, Oahu, 25 feet

Haleiwa Trench, Oahu, 25 feet

 

Haleiwa Trench, Oahu, 25 feet

Haleiwa Trench, Oahu, 25 feet

HOPPER'S HERMIT CRAB

An uncommon medium-sized species.  Easily distinguished by the dark brown spots at the 'elbow'.  Endemic to Hawaii.

Aniculus maximus

Black Rock Cave, Oahu, 85 feet

Waikiki Aquarium

HAIRY YELLOW HERMIT CRAB

Uncommon in deeper water.  Inhabits large tun, helmet, and triton shells.


INDO-PACIFIC

Dardanus lagopodes

Wakatobi, Indonesia, 25 feet

HERMIT CRAB


NORTHEAST PACIFIC

 

Pagurus armatus

Spring Bay, Victoria, Canada

 

Spring Bay, Victoria, Canada

BLACKEYED HERMIT CRAB

Pagurus caurinus

Ogden Point, Victoria, Canada

Spring Bay, Victoria, Canada

GREENMARK HERMIT CRAB

Elassochirus tenuimanus

Ogden Point, Victoria, Canada

WIDEHAND HERMIT CRAB

 

 

 

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